Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!gatech!hao!husc6!bloom-beacon!eichin From: eichin@athena.mit.edu (Mark W. Eichin) Newsgroups: comp.terminals Subject: Re: VT100's keeping up at high baud rates Message-ID: <941@bloom-beacon.MIT.EDU> Date: Wed, 17-Jun-87 13:20:30 EDT Article-I.D.: bloom-be.941 Posted: Wed Jun 17 13:20:30 1987 Date-Received: Sun, 21-Jun-87 09:54:00 EDT References: <1149@carthage.swatsun.UUCP> <8601@tekecs.TEK.COM> Sender: daemon@bloom-beacon.MIT.EDU Reply-To: eichin@athena.mit.edu (Mark W. Eichin) Organization: Massachvsetts Institvte of Technology Lines: 25 Not all microprocessor controlled terminals lose... in a previous job, I worked with Visual 200 terminals-24x80, lots of PF keys, keypad, smooth scroll (REAL smooth scroll, by pixels), nice heavy feel... AND IT DID 19200 baud W/O FLOW CONTROL! It was PERFECT at 9600baud, but at 19200 it didn't scan the keyboard as often. This was tested by driving it with a tight machine language loop on a 6Mhz z80 system, directly controlling the UART. You got one keyscan per 500-600 characters. Enough, but a bit confusing when trying to pause it. (We used ^S/^Q as HUMAN flow control - when the USER couldn't keep up, hit ^S to pause it.) This terminal had a 2Mhz Z80 inside, or maybe two of them... a bunch of roms, too. We had the roms set to have the WordStar sequences in the PF keys; this worked well, since we could program the 20 keys, 20 shifted keys, PLUS the 15 key keypad (toggled between numbers and functions, and which one was shifted.) I don't know if these terminals are still around. We had difficulty getting them after a while. They may have (shudder) EVOLVED since then... /Happy Hacking........\\.............Mark Eichin/